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    //object核心属性和方法
    toString
    isprototypeof()
    tolocalStorage()
    hasownproperty()
    constructor()
    __proto__()
    valueof()

    defineproperty和proxy//他俩的区别是个重点
    defineproperty给对象的某个属性设置对象
    proxy对整个对象进行监听

    
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